mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-04 01:50:38 +00:00
251 lines
6.3 KiB
C
251 lines
6.3 KiB
C
/* Minimal replacements for basic facilities used in the dynamic linker.
|
||
Copyright (C) 1995,96,97,98,2000,2001 Free Software Foundation, Inc.
|
||
This file is part of the GNU C Library.
|
||
|
||
The GNU C Library is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU Lesser General Public
|
||
License as published by the Free Software Foundation; either
|
||
version 2.1 of the License, or (at your option) any later version.
|
||
|
||
The GNU C Library is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
|
||
|
||
You should have received a copy of the GNU Lesser General Public
|
||
License along with the GNU C Library; if not, write to the Free
|
||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||
02111-1307 USA. */
|
||
|
||
#include <errno.h>
|
||
#include <limits.h>
|
||
#include <string.h>
|
||
#include <unistd.h>
|
||
#include <sys/types.h>
|
||
#include <sys/mman.h>
|
||
#include <ldsodefs.h>
|
||
#include <machine/weakalias.h>
|
||
|
||
#include <assert.h>
|
||
|
||
/* Minimal `malloc' allocator for use while loading shared libraries.
|
||
No block is ever freed. */
|
||
|
||
static void *alloc_ptr, *alloc_end, *alloc_last_block;
|
||
|
||
/* Declarations of global functions. */
|
||
extern void weak_function free (void *ptr);
|
||
extern void * weak_function realloc (void *ptr, size_t n);
|
||
extern unsigned long int weak_function __strtoul_internal
|
||
(const char *nptr, char **endptr, int base, int group);
|
||
extern unsigned long int weak_function strtoul (const char *nptr,
|
||
char **endptr, int base);
|
||
|
||
|
||
void * weak_function
|
||
malloc (size_t n)
|
||
{
|
||
#ifdef MAP_ANON
|
||
#define _dl_zerofd (-1)
|
||
#else
|
||
extern int _dl_zerofd;
|
||
|
||
if (_dl_zerofd == -1)
|
||
_dl_zerofd = _dl_sysdep_open_zero_fill ();
|
||
#define MAP_ANON 0
|
||
#endif
|
||
|
||
if (alloc_end == 0)
|
||
{
|
||
/* Consume any unused space in the last page of our data segment. */
|
||
extern int _end;
|
||
alloc_ptr = &_end;
|
||
alloc_end = (void *) 0 + (((alloc_ptr - (void *) 0) + _dl_pagesize - 1)
|
||
& ~(_dl_pagesize - 1));
|
||
}
|
||
|
||
/* Make sure the allocation pointer is ideally aligned. */
|
||
alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + sizeof (double) - 1)
|
||
& ~(sizeof (double) - 1));
|
||
|
||
if (alloc_ptr + n >= alloc_end)
|
||
{
|
||
/* Insufficient space left; allocate another page. */
|
||
caddr_t page;
|
||
size_t nup = (n + _dl_pagesize - 1) & ~(_dl_pagesize - 1);
|
||
page = __mmap (0, nup, PROT_READ|PROT_WRITE,
|
||
MAP_ANON|MAP_PRIVATE, _dl_zerofd, 0);
|
||
assert (page != MAP_FAILED);
|
||
if (page != alloc_end)
|
||
alloc_ptr = page;
|
||
alloc_end = page + nup;
|
||
}
|
||
|
||
alloc_last_block = (void *) alloc_ptr;
|
||
alloc_ptr += n;
|
||
return alloc_last_block;
|
||
}
|
||
|
||
/* We use this function occasionally since the real implementation may
|
||
be optimized when it can assume the memory it returns already is
|
||
set to NUL. */
|
||
void * weak_function
|
||
calloc (size_t nmemb, size_t size)
|
||
{
|
||
size_t total = nmemb * size;
|
||
void *result = malloc (total);
|
||
return memset (result, '\0', total);
|
||
}
|
||
|
||
/* This will rarely be called. */
|
||
void weak_function
|
||
free (void *ptr)
|
||
{
|
||
/* We can free only the last block allocated. */
|
||
if (ptr == alloc_last_block)
|
||
alloc_ptr = alloc_last_block;
|
||
}
|
||
|
||
/* This is only called with the most recent block returned by malloc. */
|
||
void * weak_function
|
||
realloc (void *ptr, size_t n)
|
||
{
|
||
void *new;
|
||
if (ptr == NULL)
|
||
return malloc (n);
|
||
assert (ptr == alloc_last_block);
|
||
alloc_ptr = alloc_last_block;
|
||
new = malloc (n);
|
||
assert (new == ptr);
|
||
return new;
|
||
}
|
||
|
||
|
||
/* Define our own version of the internal function used by strerror. We
|
||
only provide the messages for some common errors. This avoids pulling
|
||
in the whole error list. */
|
||
|
||
char * weak_function
|
||
__strerror_r (int errnum, char *buf, size_t buflen)
|
||
{
|
||
char *msg;
|
||
|
||
switch (errnum)
|
||
{
|
||
case ENOMEM:
|
||
msg = (char *) "Cannot allocate memory";
|
||
break;
|
||
case EINVAL:
|
||
msg = (char *) "Invalid argument";
|
||
break;
|
||
case ENOENT:
|
||
msg = (char *) "No such file or directory";
|
||
break;
|
||
case EPERM:
|
||
msg = (char *) "Operation not permitted";
|
||
break;
|
||
case EIO:
|
||
msg = (char *) "Input/output error";
|
||
break;
|
||
case EACCES:
|
||
msg = (char *) "Permission denied";
|
||
break;
|
||
default:
|
||
/* No need to check buffer size, all calls in the dynamic linker
|
||
provide enough space. */
|
||
msg = (char *) "Error";
|
||
break;
|
||
}
|
||
|
||
return msg;
|
||
}
|
||
|
||
#ifndef NDEBUG
|
||
|
||
/* Define (weakly) our own assert failure function which doesn't use stdio.
|
||
If we are linked into the user program (-ldl), the normal __assert_fail
|
||
defn can override this one. */
|
||
|
||
void weak_function
|
||
__assert_fail (const char *assertion,
|
||
const char *file, unsigned int line, const char *function)
|
||
{
|
||
_dl_fatal_printf ("\
|
||
Inconsistency detected by ld.so: %s: %u: %s%sAssertion `%s' failed!\n",
|
||
file, line, function ?: "", function ? ": " : "",
|
||
assertion);
|
||
|
||
}
|
||
|
||
void weak_function
|
||
__assert_perror_fail (int errnum,
|
||
const char *file, unsigned int line,
|
||
const char *function)
|
||
{
|
||
char errbuf[64];
|
||
_dl_fatal_printf ("\
|
||
Inconsistency detected by ld.so: %s: %u: %s%sUnexpected error: %s\n",
|
||
file, line, function ?: "", function ? ": " : "",
|
||
__strerror_r (errnum, errbuf, sizeof (errbuf)));
|
||
}
|
||
|
||
#endif
|
||
|
||
unsigned long int weak_function
|
||
__strtoul_internal (const char *nptr, char **endptr, int base, int group)
|
||
{
|
||
unsigned long int result = 0;
|
||
long int sign = 1;
|
||
|
||
while (*nptr == ' ' || *nptr == '\t')
|
||
++nptr;
|
||
|
||
if (*nptr == '-')
|
||
{
|
||
sign = -1;
|
||
++nptr;
|
||
}
|
||
else if (*nptr == '+')
|
||
++nptr;
|
||
|
||
if (*nptr < '0' || *nptr > '9')
|
||
{
|
||
if (endptr != NULL)
|
||
*endptr = (char *) nptr;
|
||
return 0UL;
|
||
}
|
||
|
||
assert (base == 0);
|
||
base = 10;
|
||
if (*nptr == '0')
|
||
{
|
||
if (nptr[1] == 'x' || nptr[1] == 'X')
|
||
{
|
||
base = 16;
|
||
nptr += 2;
|
||
}
|
||
else
|
||
base = 8;
|
||
}
|
||
|
||
while (*nptr >= '0' && *nptr <= '9')
|
||
{
|
||
unsigned long int digval = *nptr - '0';
|
||
if (result > LONG_MAX / 10
|
||
|| (result == ULONG_MAX / 10 && digval > ULONG_MAX % 10))
|
||
{
|
||
errno = ERANGE;
|
||
if (endptr != NULL)
|
||
*endptr = (char *) nptr;
|
||
return ULONG_MAX;
|
||
}
|
||
result *= base;
|
||
result += digval;
|
||
++nptr;
|
||
}
|
||
|
||
if (endptr != NULL)
|
||
*endptr = (char *) nptr;
|
||
return result * sign;
|
||
}
|